James a



(No Model.)

J. A. CAULDWELL.

BOILER.

No. 370,241. Patented Sept. 20, 1887.v

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JAMES A. CAULDlVELL, OF OVVEGO, NEW YORK.

BOILER.

SPECIFICATION forming part of Letters Patent No. 370,241, datedSeptember 20, 1887.

(No model To all whom it may concern:

Be it known that I, JAMES A. GAULDWELL, of Owego, in the county of Tiogaand State of New York, have invented a new and Improved Boiler, of whichthe following is a full, clear, and exact description.

This invention relates to a novel form of boiler of the sectional type,the object of the invention being to so dispose and form the bolts bywhich the several sections are held together that the sections and thebolts will expand about equally, and consequently the bolts will at alltimes act to hold the sections in close contact.

To the ends named the invention consists in the construction andarrangement of parts, as will be hereinafter fully described, andspecifically pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in all the views. Figure l is a central verticalsectional view of my improved form of boiler, the View being taken online a: a: of Fig. 2. Fig. 2 is a horizontal section taken on line y yof Fig. 1; and Fig. 3 is a view of a portion of the upper section of theboiler, the view being taken upon a line corresponding with that of theline z z in Fig. 2.

In constructing such a boiler as the one forming the subject-matter ofthis application, and illustrated in the drawings above referred to,Iprovide a number of circular sections, such as those shown at 10, 11,12, 13, and 14 in Fig. 1, these sections, with the exception of thesection 13, being formed of annular castings, in which the outer walls,15, and the inner walls, 16, are non-concentric. The section 13 is acrescentshaped casting-that is, a casting formed with an opening, 20,through that side where the inner wall, 16, most closely approaches theouter wall, 15.

The upper and lower walls of each of the boilersections are formed withapertures 2 3 4, 820., the apertures 2 of each section being arranged toregister with the apertures 2 of all the other sections, and so on withall of the correspondingly numbered and arranged apertures.

In constructing a boiler from such sect-ions as those illustrated anddescribed, the section 14 is mounted in a proper bed above an ash-pit,2l, the grate-bars 22 being arranged in connection with this section.The section 13 is placed in being threaded in order that they may beengaged below by nuts 31 and above by nuts 32, the nuts 32 being formedwith inwardly-extending flanges 6,which flanges act as shields toprotect the upper ends of the tubes from the action of the fire. Theupper section, 10, is formed with a steam dome or chamber, 40.

A boiler constructed as described is inclosed within a jacket, 50,through the top of which there is inserted a downwardly-extendingcylinder, 41, that is closed by a cover, 42, the fire door of the boilerbeing located in front of the opening 20 of the section 13, as will bereadily understood.

Such being the general construction of the boiler, the operation is asfollows: A fire having been kindled within the fire-chamberthat is,above the grate-bars 22-the heated gases and products of combustion willpass upward above the section 10, and then downward through the tubes30, to pass again upward between the jacket and the outer Walls of theboiler-section; and in practice it will be found that the tubes 30 andthe boiler-sections will expand uniformly, and that the nuts arranged inconnection with the tubes, having been once properly adjusted, will notrequire any further attention.

Havingthus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. A. sectional boiler formed of a series ofhollow rings having series of apertures in their upper and lower sides,the rings resting one upon the other with their apertures in alignment,and the space within the rings forming the fire and combustion chamber,the tubular bolts extending down through the apertures of the severalrings and forming the flues for the products of combustion, and nutsscrewing on lheends of the tubes and binding the faces of the ringstogether, the inner apertures being of greater diameter than the tubesto form water-spaces, substantially as set forth.

2. The combination, with the series of hollo'w rings 10, 11, 12, 13, and14, resting one upon the other, and having a series of aligned aperturesthrough their upper and lower faces, a door-opening, 20, being formed-inthe ring 13, and the ring 14 forming the fire-pot, below which is theash-pit, of the tubular bolts 30, extending through the apertures in theseveral rings to form the boiler-fines, nuts screwing on the ends of thebolts and drawing the rings firmly together, and the outer casing, 50,whereby the products of combustion will pass up within the rings, thendown through the tubular bolts and up around the outer sides of therings to the outlet in the casing, substantially as set forth.

3. A sectional boiler comprising'a series of hollow rings securedtogether and having series of registering apertures, the space withinthe rings forming the fire and combustion chamber, and the inner wallsof the rings being eccentric to the outer walls, and a door-openingbeing formed through one of the rings at its point of leasteccentricity, substantially as set forth.

4. The combination, with a series of boilersections formed withregistering apertures, of a series of tubes-which extend through saidapertures, said tubes being of less diameter than the apertures inconnection with which they are arranged, and upper and lowerretaining-nuts arranged in connection with the tubes, the upperretaining-nuts being formedwith inwardly-extending flanges,substantially as described.

JAMES A. CAULDWELL.

Witnesses:

EDWARD KENT, J r., O. SEDGWIOK.

